<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="请输入添加的数量">
<input type="button" value="帅哥" onclick="f(1)">
<input type="button" value="美女" onclick="f(2)">
<hr>
<script>
  let input = document.querySelector("input");
  function f(x) {
    let imgURL= x==1?"a.jpg":"b.jpg";
    for (let i = 0; i < input.value; i++){
      let img = document.createElement("img");
      img.src = imgURL;
      document.body.append(img)
    }
  }
</script>
</body>
</html>